## Homework 5, due February 23, 2011.

Due Wednesday, February 23, 2011.
goodwine
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### Homework 5, due February 23, 2011.

Exercises: 6.13, 6.14 and 6.16.
Bill Goodwine, 376 Fitzpatrick
rahr

### Re: Homework 5, due February 23, 2011.

On problem 6.14, since we are doing A1, A2, and A9 from 6.2, do you want us to use the initial condition given in 6.3 for A2 and A9 (not A3 and A9 as it's written)? Also, is it alright if we use ode45 to determine the approximate numerical solution for problem 6.16?
goodwine
Posts: 1596
Joined: Tue Aug 24, 2004 4:54 pm
Location: 376 Fitzpatrick
Contact:

### Re: Homework 5, due February 23, 2011.

rahr wrote:On problem 6.14, since we are doing A1, A2, and A9 from 6.2, do you want us to use the initial condition given in 6.3 for A2 and A9 (not A3 and A9 as it's written)? Also, is it alright if we use ode45 to determine the approximate numerical solution for problem 6.16?
Yes to both.
Bill Goodwine, 376 Fitzpatrick
rahr

### Re: Homework 5, due February 23, 2011.

On 6.13, I am having a difficult time doing the method of undetermined coefficients. I was able to find the solution using diagonalization and VoP. However, despite now seeing the solution, I still have no idea how to approach it using undetermined coefficients because of how the equations are dependent and the fact that there is an eigenvalue of negative four. Can you give me a hint on how to approach the problem using this method?
goodwine
Posts: 1596
Joined: Tue Aug 24, 2004 4:54 pm
Location: 376 Fitzpatrick
Contact:

### Re: Homework 5, due February 23, 2011.

rahr wrote:On 6.13, I am having a difficult time doing the method of undetermined coefficients. I was able to find the solution using diagonalization and VoP. However, despite now seeing the solution, I still have no idea how to approach it using undetermined coefficients because of how the equations are dependent and the fact that there is an eigenvalue of negative four. Can you give me a hint on how to approach the problem using this method?
You need to multiply the assumed form of the particular solution by t, or maybe t^2.
Bill Goodwine, 376 Fitzpatrick
whawes

### Re: Homework 5, due February 23, 2011.

Can you post the code from class?
goodwine